these, as there may be with _musical strings_. Having therefore seen what
is the cause of Congruity or Incongruity, those relative properties of
fluids, we may, from what has been said, very easily collect, what is the
_reason_ of those Relative proprieties also between _fluid bodies_ and
_solid_; for since all bodies consist of _particles_ of such a _Substance_,
_Figure_, and _Bulk_; but in some they are _united_ together more _firmly_
then to be _loosened_ from each other by every _vibrative_ motion (though I
imagine that there is no body in the world, but that some degree of
agitation may, as I hinted before, agitate and loosen the particles so as
to make them fluid) those _cohering_ particles may _vibrate_ in the same
manner almost as those that are _loose_ and become _unisons_ or _discords_,
as I may so speak, to them. Now that the _parts_ of all _bodies_, though
never so _solid_, do yet _vibrate_, I think we need go no further for
proof, then that _all_ bodies have some _degrees_ of _heat_ in them, and
that there has not been yet found any thing _perfectly cold_: Nor can I
believe indeed that there is any such thing in Nature, as a body whose
particles are at _rest_, or _lazy_ and _unactive_ in the great _Theatre_ of
the _World_, it being quite _contrary_ to the grand _Oeconomy_ of the
Universe. We see therefore what is the reason of the _sympathy_ or uniting
of some bodies together, and of the _antipathy_ or flight of others from
each other: For _Congruity_ seems nothing else but a _Sympathy_, and
_Incongruity_ an _Antipathy_ of bodies, hence _similar_ bodies once
_united_ will not _easily part_, and _dissimilar_ bodies once _disjoyn'd_
will not _easily unite_ again; from hence may be very easily deduc'd the
reason of the _suspension_ of _water_ and _Quick-silver_ above their usual
_station_, as I shall more at large anon shew.

These properties therefore (alwayes the concomitants of fluid bodies)
produce these following visible _Effects_: